specialFolderPath("documents") is a writable location, sandboxed to be accessible only to the app. Other apps will have their own sandboxed documents folder. It is not a generally accessible folder for any and all user documents. The specialFolderPath folders are automatically accessible to you app, but the names are case sensitive (ie lower case only) on mobile (mixed case is OK on desktop, and the paths have different destinations - on desktop "documents" really does mean the user documents folder).